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Thank you in advance
Originally Posted by DAH7542
Dear bayan,
They way I handle PVT analysis for reservoir simulation includes the following steps:
1. Review of existing information, i.e. available PVT analysis
2. Quality control of available PVT lab data:
- Make sure that the Y-function is linear for Constant Composition Expansion (CCE) test.
- Plot measured reservoir pressure and produced GOR vs time and check that the bubble point pressure as measured from the PVT lab data is consistent. Also check that the produced GOR for pressures above Pb is similar to the Rs measured in lab. This is highly useful when it comes to determine if lab Rs is reliable.
3. Perform standard corrections for the Differential Liberation (DL) test by incorporating the Separator Test (ST) conditions. Alternatively, you could use Carlson's correction (Practical Reservoir Simulation by Carlson, page 117). This author textually says: "modify the Bo and Rs curves based on field observed GORs. The differential data is adjusted to field data based on the ratio of field observed GOR divided by lab differential GOR". I've found this correction much more useful and effective than the standard widely-used correction.
4. Construct your PVT tables in the format specified by your simulator and make sure that:
- PVT tables cover the entire expected range of pressures in your simulation to avoid extrapolations of PVT data (sometimes to non-physical values)
- Use an Excel spreadsheet to back-calculate oil compressibility (Co) from your Bo, Rs and pressure data to avoid abrupt fluctuations of Co
- Do you need to incorporate the variable bubble point option in your simulation? if so, do it, otherwise you wont be able to reproduce the physics of your system
5. Finally, once you have done this, run a case and include EXTRAMPS keyword (if ECLIPSE is being used) to report any PVT extrapolation. Use similar keywords if ECLIPSE is not being used.
They way I handle PVT analysis for reservoir simulation includes the following steps:
1. Review of existing information, i.e. available PVT analysis
2. Quality control of available PVT lab data:
- Make sure that the Y-function is linear for Constant Composition Expansion (CCE) test.
- Plot measured reservoir pressure and produced GOR vs time and check that the bubble point pressure as measured from the PVT lab data is consistent. Also check that the produced GOR for pressures above Pb is similar to the Rs measured in lab. This is highly useful when it comes to determine if lab Rs is reliable.
3. Perform standard corrections for the Differential Liberation (DL) test by incorporating the Separator Test (ST) conditions. Alternatively, you could use Carlson's correction (Practical Reservoir Simulation by Carlson, page 117). This author textually says: "modify the Bo and Rs curves based on field observed GORs. The differential data is adjusted to field data based on the ratio of field observed GOR divided by lab differential GOR". I've found this correction much more useful and effective than the standard widely-used correction.
4. Construct your PVT tables in the format specified by your simulator and make sure that:
- PVT tables cover the entire expected range of pressures in your simulation to avoid extrapolations of PVT data (sometimes to non-physical values)
- Use an Excel spreadsheet to back-calculate oil compressibility (Co) from your Bo, Rs and pressure data to avoid abrupt fluctuations of Co
- Do you need to incorporate the variable bubble point option in your simulation? if so, do it, otherwise you wont be able to reproduce the physics of your system
5. Finally, once you have done this, run a case and include EXTRAMPS keyword (if ECLIPSE is being used) to report any PVT extrapolation. Use similar keywords if ECLIPSE is not being used.
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